Allow output constraints on "asm goto"

Summary:
Remove the restrictions that preventing "asm goto" from returning non-void
values. The values returned by "asm goto" are only valid on the "fallthrough"
path.

Reviewers: jyknight, nickdesaulniers, hfinkel

Reviewed By: jyknight, nickdesaulniers

Subscribers: rsmith, hiraditya, llvm-commits, cfe-commits, craig.topper, rnk

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D69876

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 00b05c5db2f..1505506dbf0 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -2847,6 +2847,7 @@ void SelectionDAGBuilder::visitCallBr(const CallBrInst &I) {
   assert(isa<InlineAsm>(I.getCalledValue()) &&
          "Only know how to handle inlineasm callbr");
   visitInlineAsm(&I);
+  CopyToExportRegsIfNeeded(&I);
 
   // Retrieve successors.
   MachineBasicBlock *Return = FuncInfo.MBBMap[I.getDefaultDest()];
@@ -2856,6 +2857,7 @@ void SelectionDAGBuilder::visitCallBr(const CallBrInst &I) {
   for (unsigned i = 0, e = I.getNumIndirectDests(); i < e; ++i) {
     MachineBasicBlock *Target = FuncInfo.MBBMap[I.getIndirectDest(i)];
     addSuccessorWithProb(CallBrMBB, Target);
+    Target->setIsInlineAsmBrIndirectPad();
   }
   CallBrMBB->normalizeSuccProbs();